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divizorii lui 20 reunit cu multipli lui 15

Răspuns :

D20=(1,2,4,5,10,20)
M15=(0,15,30,45,60,75------)

(1,2,4,5,10,20)U(0,15,30,45,60,75,,,,,,)=(0,1,2,4,5,10,15,20,30,45,60,75,,,,,,)